I have a Contax 645 Carl Zeiss 350mm/F4 Tele Apo-tessar for sale.It's rarely used, so it's like new.

Mind you:

1. It's super heavy, bulky, large, and not portable at all.2. It's AF is slow, don't expect to shoot bird-on-fly with this.3. In dark, it's not even focus right. Not a problem of this special piece, it's common for this lens.4. Missing the original lens hood, but I have two third party metal hood for it. (I cascade two when use it). It turns out to be a much better shade/protection than the original hood. (but not as portable as the original, but hey, it's bad enough even without it, so, what the hack!).

Otherwise, this is a fantastic lens -- what can I say.If you are interested, please send in your best offer before next Friday. The best offer above $3600 get it. You can find the price from KEH as the reference.